# string_manipulations.py  
  
# 变量  
greeting = "你的姓名学号后两位：Hello"
farewell = "你的姓名学号后两位：Goodbye"
  
# 函数  
def concatenate(str1, str2):  
    return str1 + " " + str2  
  
def reverse_string(s):
    return s[::-1]

if __name__ == '__main__':
    print('你的姓名学号后两位：')
    print(concatenate(greeting,farewell))
    print(reverse_string(farewell))





